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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120c329a9a6dcb6c27f79e8d3cd5b56a75390784ce4212f35a9a419cb4833a5c' 
  AND token = 'TaVMo10crt3taY64F7Ty1/t2EaSjrjTDW/780zlisMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}